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| author | Sonic Zhang <sonic.adi@gmail.com> | 2006-09-27 01:50:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-27 08:26:14 -0700 |
| commit | 910e46da4b4e93d56ffea318c64afa41868d5e6d (patch) | |
| tree | 67f7dd9086dcf456101c843a1e310e7090a590db /mm/nommu.c | |
| parent | 0159b141d8b1f9b9f9cffacae47bec1e05c63b8b (diff) | |
| download | lwn-910e46da4b4e93d56ffea318c64afa41868d5e6d.tar.gz lwn-910e46da4b4e93d56ffea318c64afa41868d5e6d.zip | |
[PATCH] Check if start address is in vma region in NOMMU function get_user_pages()
In NOMMU arch, if run "cat /proc/self/mem", data from physical address 0
are read. This behavior is different from MMU arch. In IA32, message
"cat: /proc/self/mem: Input/output error" is reported.
This issue is rootcaused by not validate the start address in NOMMU
function get_user_pages(). Following patch solves this issue.
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 00ffa974c90c..2af50831183f 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -129,16 +129,20 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, struct page **pages, struct vm_area_struct **vmas) { int i; - static struct vm_area_struct dummy_vma; + struct vm_area_struct *vma; for (i = 0; i < len; i++) { + vma = find_vma(mm, start); + if(!vma) + return i ? : -EFAULT; + if (pages) { pages[i] = virt_to_page(start); if (pages[i]) page_cache_get(pages[i]); } if (vmas) - vmas[i] = &dummy_vma; + vmas[i] = vma; start += PAGE_SIZE; } return(i); |